Explosion at Egypt Nile Delta church kills at least 21, injures 50

By Ahmed Tolba and Mohamed AbdellahCAIRO (Reuters) - At least 21 people were killed and 50 injured on Sunday when an explosion rocked a Coptic church in Egypt's Nile Delta, state television reported, the latest assault on a religious minority that has increasingly been targeted by Islamist militants.There was no immediate claim of responsibility and the cause of the blast, just one week before Coptic Easter and the same month that Pope Francis is scheduled to visit Egypt, was not known.The bombi